View single post by slychiu

Posted: Thursday Jan 26th, 2017 01:47 pm

Joined:	Saturday Apr 29th, 2006
Location:	Singapore
Posts:	5500
Status:	Offline

There could be a problem with the digital phone lines via ADSL, fiber and VOIP
These may be good for voice conversations but transmission of DTMF tones over these lines may be subject to delays and distortion.

Perhaps when you upgrade, suggest a GSM module?

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